How is the knee joint creaking when it moves?

The click of body joints doesn't necessarily mean that our joints are sick. The snap of joints can be divided into physiological snap and pathological snap.

The physiological snapping sound is just snapping sound, the joints are painless, there is no redness and swelling, and it does not affect human activities. It is a normal physiological phenomenon and has no influence on the human body.

The causes of physiological snapping are gas escape and joint friction.

Gas escape: there is synovial fluid between human joints to lubricate joints. Synovial fluid contains gases such as oxygen, nitrogen and carbon dioxide. When the joint is stretched or flexed, the joint capsule expands and contracts, and the gas is released quickly, forming bubbles. When the bubble bursts or vibrates with the synovial fluid, it will make a crisp sound.

Joint friction: During joint activity, friction may occur between joint surfaces, between cartilage pads and joint surfaces, and between tendons and joint capsules, resulting in sound. In particular, many elderly people will find that their joints often snap, which may be because with the increase of age, smooth cartilage is gradually lost, resulting in rough surface and noise when rubbing.

Pathological snapping refers to snapping accompanied by pain, redness or limited activity.

There are many reasons for pathological snapping, such as meniscus injury, joint synovium, cartilage, ligament, tendon tissue lesions around joints and so on.

In short, if it's just joint bounce and there is no discomfort, don't worry; If you feel unwell at the same time, it is recommended to go to the hospital as soon as possible.